Buggy code:
break ; case TerminalTokens . TokenNameLBRACE : popElement ( CompletionParser . K_BETWEEN_NEW_AND_LEFT_BRACKET ) ; break ; case TerminalTokens . TokenNameLBRACKET : if ( ( topKnownElementKind ( CompletionParser . COMPLETION_OR_ASSIST_PARSER ) ) == ( CompletionParser . K_BETWEEN_NEW_AND_LEFT_BRACKET ) ) { popElement ( CompletionParser . K_BETWEEN_NEW_AND_LEFT_BRACKET ) ; pushOnElementStack ( CompletionParser . K_ARRAY_CREATION ) ; } break ; case TerminalTokens . TokenNameRBRACE : if ( ( topKnownElementKind ( CompletionParser . COMPLETION_OR_ASSIST_PARSER ) ) == ( CompletionParser . K_BLOCK_DELIMITER ) ) { popElement ( CompletionParser . K_BLOCK_DELIMITER ) ; } else { popElement ( CompletionParser . K_ARRAY_INITIALIZER ) ; } break ; case TerminalTokens . TokenNameRBRACKET : if ( ( topKnownElementKind ( CompletionParser . COMPLETION_OR_ASSIST_PARSER ) ) == ( CompletionParser . K_BETWEEN_LEFT_AND_RIGHT_BRACKET ) ) { popElement ( CompletionParser . K_BETWEEN_LEFT_AND_RIGHT_BRACKET ) ; } break ; } } super . consumeToken ( token ) ; if ( ( ( ( token == ( TerminalTokens . TokenNameIdentifier ) ) && ( ( this . identifierStack [ this . identifierPtr ] ) == ( assistIdentifier ( ) ) ) ) && ( ( this . currentElement ) == null ) ) && ( this . isIndirectlyInsideFieldInitialization ( ) ) ) { this . scanner . eofPosition = ( ( cursorLocation ) < ( Integer . MAX_VALUE ) ) ? ( cursorLocation ) + 1 : cursorLocation ; } if ( ( isInsideMethod ( ) ) || ( isInsideFieldInitialization ( ) ) ) { switch ( token ) { case TerminalTokens . TokenNameDOT : switch ( previous ) { case TerminalTokens . TokenNamethis : this . invocationType = CompletionParser . EXPLICIT_RECEIVER ; break ; case TerminalTokens . TokenNamesuper : this . invocationType = CompletionParser . SUPER_RECEIVER ; break ; case TerminalTokens . TokenNameIdentifier : if ( ( topKnownElementKind ( CompletionParser . COMPLETION_OR_ASSIST_PARSER ) ) != ( CompletionParser . K_BETWEEN_NEW_AND_LEFT_BRACKET ) ) { if ( ( this . identifierPtr ) != prevIdentifierPtr ) { this . invocationType = CompletionParser . EXPLICIT_RECEIVER ; } else { this . invocationType = CompletionParser . NAME_RECEIVER ; } } break ; } break ; case TerminalTokens . TokenNameIdentifier : if ( previous == ( TerminalTokens . TokenNameDOT ) ) { if ( ( ( ( ( this . invocationType ) != ( CompletionParser . SUPER_RECEIVER ) ) && ( ( this . invocationType ) != ( CompletionParser . NAME_RECEIVER ) ) ) && ( ( this . invocationType ) != ( CompletionParser . ALLOCATION ) ) ) && ( ( this . invocationType ) != ( CompletionParser . QUALIFIED_ALLOCATION ) ) ) { this . invocationType = CompletionParser . EXPLICIT_RECEIVER ; this . qualifier = this . expressionPtr ; } } break ; case TerminalTokens . TokenNamenew : pushOnElementStack ( CompletionParser . K_BETWEEN_NEW_AND_LEFT_BRACKET ) ; this . qualifier = this . expressionPtr ; if ( previous == ( TerminalTokens . TokenNameDOT ) ) { this . invocationType = CompletionParser . QUALIFIED_ALLOCATION ; } else { this . invocationType = CompletionParser . ALLOCATION ; } break ; case TerminalTokens . TokenNamethis : if ( previous == ( TerminalTokens . TokenNameDOT ) ) { this . invocationType = CompletionParser . QUALIFIED_ALLOCATION ; this . qualifier = this . expressionPtr ; } break ; case TerminalTokens . TokenNamesuper : if ( previous == ( TerminalTokens . TokenNameDOT ) ) { this . invocationType = CompletionParser . QUALIFIED_ALLOCATION ; this . qualifier = this . expressionPtr ; } break ; case TerminalTokens . TokenNamecatch : pushOnElementStack ( CompletionParser . K_BETWEEN_CATCH_AND_RIGHT_PAREN ) ; break ; case TerminalTokens . TokenNameLPAREN : <START_BUG> if ( ( ( this . invocationType ) == ( CompletionParser . NO_RECEIVER ) ) || ( ( this . invocationType ) == ( CompletionParser . NAME_RECEIVER ) ) ) { <END_BUG> this . qualifier = this . expressionPtr ; } switch ( previous ) { case TerminalTokens . TokenNameIdentifier : if ( ( topKnownElementKind ( CompletionParser . COMPLETION_OR_ASSIST_PARSER ) ) == ( AssistParser . K_SELECTOR ) ) { this . pushOnElementStack ( CompletionParser . K_SELECTOR_INVOCATION_TYPE , this . invocationType ) ; this . pushOnElementStack ( CompletionParser . K_SELECTOR_QUALIFIER , this . qualifier ) ; } this . qualifier = - 1 ; this . invocationType = CompletionParser . NO_RECEIVER ; break ; case TerminalTokens . TokenNamethis : if ( ( topKnownElementKind ( CompletionParser . COMPLETION_OR_ASSIST_PARSER ) ) == ( AssistParser . K_SELECTOR ) ) { this . pushOnElementStack ( CompletionParser . K_SELECTOR_INVOCATION_TYPE , ( ( this . invocationType ) == ( CompletionParser . QUALIFIED_ALLOCATION ) ? CompletionParser . QUALIFIED_ALLOCATION : CompletionParser . ALLOCATION ) ) ; this . pushOnElementStack ( CompletionParser . K_SELECTOR_QUALIFIER , this . qualifier ) ; } this . qualifier = - 1 ; this . invocationType = CompletionParser . NO_RECEIVER ; break ; case TerminalTokens . TokenNamesuper : if ( ( topKnownElementKind ( CompletionParser . COMPLETION_OR_ASSIST_PARSER ) ) == ( AssistParser . K_SELECTOR ) ) { this . pushOnElementStack ( CompletionParser . K_SELECTOR_INVOCATION_TYPE , ( ( this . invocationType ) == ( CompletionParser . QUALIFIED_ALLOCATION ) ? CompletionParser . QUALIFIED_ALLOCATION : CompletionParser . ALLOCATION ) ) ; this . pushOnElementStack ( CompletionParser . K_SELECTOR_QUALIFIER , this . qualifier ) ; } this . qualifier = - 1 ; this . invocationType = CompletionParser . NO_RECEIVER ; break ; } break ; case TerminalTokens . TokenNameLBRACE : ( this . bracketDepth ) ++ ; int kind ; if ( ( ( ( kind = topKnownElementKind ( CompletionParser . COMPLETION_OR_ASSIST_PARSER ) ) == ( AssistParser . K_FIELD_INITIALIZER_DELIMITER ) ) || ( kind == ( CompletionParser . K_LOCAL_INITIALIZER_DELIMITER ) ) ) || ( kind == ( CompletionParser . K_ARRAY_CREATION ) ) ) { pushOnElementStack ( CompletionParser . K_ARRAY_INITIALIZER , endPosition ) ; } else { switch ( previous ) { case TerminalTokens . TokenNameRPAREN : switch ( previousKind ) { case CompletionParser . K_BETWEEN_IF_AND_RIGHT_PAREN : pushOnElementStack ( CompletionParser . K_BLOCK_DELIMITER , CompletionParser . IF ) ;

Fix:
if ( ( ( ( this . invocationType ) == ( CompletionParser . NO_RECEIVER ) ) || ( ( this . invocationType ) == ( CompletionParser . NAME_RECEIVER ) ) ) || ( ( this . invocationType ) == ( CompletionParser . SUPER_RECEIVER ) ) ) {